C# 回调函数理解和示例

回调函数是将一个方法作为参数传递给另一个方法的技术。在C#中，回调函数可以用来实现底层数据接收的回调、订单支付的回调等等。以下是两个示例来帮助理解回调函数在C#中的使用：
示例1：

namespace CallBackFunction {
    class Program {
        static void Main(string[] args) {
            Program prog = new Program();
            SumClass sc = new SumClass();
            int result = sc.SetCallBack(prog.GetSum);
            Console.WriteLine(result.ToString());
        }
        
        private int GetSum(int a, int b) {
            return (a + b);
        }
    }
    
    class SumClass {
        public delegate int Sum(int num1, int num2);
        public Sum OnSum = null;
        
        public void SetCallBack(Sum Parameter) {
            this.OnSum = Parameter;
        }
        
        private void CallBackFunction(int num1, int num2) {
            if (OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
        
        private void CallBackFunction(int num1, int num2) {
            if(OnSum != null) {
                OnSum(num1, num2);
            }
        }
    }
}

示例2：

namespace CallBackFunction {
    class Program {
        static void Main(string[] args) {
            Program prog = new Program();
            SumClass sc = new SumClass();
            int result = sc.SumAll(prog.GetSum);
            Console.WriteLine(result.ToString());
        }
        
        private int GetSum(int a, int b) {
            return (a + b);
        }
    }
    
    class SumClass {
        public delegate int Sum(int num1, int num2);
        
        public int SumAll(Sum sum) {
            //可以进行其他操作
            return sum(1, 2);
        }
    }
}

在这两个示例中，我们可以看到回调函数的使用。在第一个示例中，通过将`GetSum`方法作为参数传递给`SetCallBack`方法来设置回调函数。在第二个示例中，通过将`GetSum`方法作为参数传递给`SumAll`方法来实现回调函数。这样，当回调函数被调用时，传递的方法将被执行并返回相应的结果。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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